Comparison of QT intervals in African-Americans versus Caucasians

The Effects of Glucose Tolerance, Hypertension, and Race on Heart Rate Variability, QT Interval Duration, and Left Ventricular Hypertrophy in Overweight-Obese Adolescents

“…Though studies were not identified that examined this factor in adolescents, in adults conflicting reports state that in blacks vs. whites QT Interval duration is shorter , prolonged (Sgarbossa et al, 2000), and not even affected by race (Peeters et al, 2008). In this study of black and white overweight-obese youth, no significant difference was identified for QT Interval duration between race groups.…”

“…However, a study in adults suggests that QTc is shorter in healthy blacks than whites (Dekker, Crow, Hannan, Schouten, & Folsom, 2004). Challenging these findings, researchers identified contrary results but acknowledged a small sample size as a possible limitation (Sgarbossa, Pinski, Williams, Pavlovic-Surjancev, Tang, & Trohman, 2000). Researchers have also suggested that race in general is not considered a risk factor for QT prolongation (Peeters, Janssen, Kakuda, Scholler-Gyure, Lachaert, Hoetelmans, et al, 2008).…”

Electrocardiograms in African Americans and Non–African Americans Presenting with Takotsubo Syndrome

“…Are there automated QTc measurements available to corroborate the manual measurements? The longer QTc interval in AA than in non-AA upon presentation 1 is puzzling and bespeaks of a later presentation to the hospital of the former, as prior work has shown that the QTc interval in both men and women AA is either shorter 4,5 or no different for whites. [6][7][8] However, this does not explain why the maximum achieved QTc during the index hospitalization 1 was longer in the AA than in the non-AA, and this will require confirmation in future studies of AA and non-AA patients with TTS.…”

HIV Protease Inhibitors Induced Prolongation of the QT Interval: Electrophysiology and Clinical Implications

“…74 However, this was not confirmed in another study. 75 QT intervals normally shorten with tachycardia and lengthen with bradycardia. Therefore, a rate-corrected QT (QTc) interval should be calculated.…”